Discoverability
Can an agent find and enumerate the site — canonical URLs, Link headers, and the sitemap.
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page-parsed
Canonical URL
A single, absolute, in-<head> <link rel="canonical"> (and/or Link header) pointing at the preferred URL.
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page-parsed
Link header (RFC 8288)
A well-formed Link: response header — angle-bracketed URI, a usable rel, resolvable target.
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site-wide file
XML sitemap
A sitemaps.org sitemap discovered via robots.txt Sitemap: or /sitemap.xml — well-formed, namespaced, absolute <loc>s.